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Their appeal lies in the combination of their earth\u2010abundance, low toxicity, and suitable optoelectronic properties. However, the practical deployment of these materials is hindered by their intrinsic instability under operating conditions, primarily due to photocorrosion, interfacial charge recombination, and limited carrier transport. This review provides a comprehensive overview of recent strategies developed to improve the stability of the most studied Cu\u2010based photocathodes in relevant reported works. Specifically, seven key approaches are discussed: (i) optimization of electrical contact with the substrate, (ii) use of hole\u2010selective layers, (iii) electron\u2010extraction overlayers, (iv) protective coatings, (v) surface passivation strategies, (vi) integration of co\u2010catalysts, and (vii) synergistic strategies. Particular emphasis is placed on how each strategy addresses specific degradation mechanisms, and how synergistic combinations can enable durable and efficient PEC operation. Finally, the present review outlines current challenges related to scalability, fabrication compatibility, and real\u2010world durability, and highlights emerging directions in materials design and device integration. Unlike previous reviews that predominantly compare device efficiencies, this work places stability at its core, providing a strategy\u2010oriented perspective on how Cu\u2010based photocathodes can be made durable under operational conditions. By systematically connecting structure, interface, and function, this work aims to guide the development of robust Cu\u2010based photocathodes for sustainable solar fuel production.\n                  <\/jats:p>","DOI":"10.1002\/gch2.202500555","type":"journal-article","created":{"date-parts":[[2026,1,9]],"date-time":"2026-01-09T06:47:26Z","timestamp":1767941246000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Stabilizing Cu\u2010Based Photocathodes: From Interfacial Engineering to Advanced Architectures"],"prefix":"10.1002","volume":"10","author":[{"given":"Alejandro","family":"Garc\u00eda\u2010Eguiz\u00e1bal","sequence":"first","affiliation":[{"name":"Photoactivated Processes Unit IMDEA Energy  M\u00f3stoles Madrid Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Javier","family":"Llorente\u2010L\u00f3pez","sequence":"additional","affiliation":[{"name":"Photoactivated Processes Unit IMDEA Energy  M\u00f3stoles Madrid Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Laura","family":"Collado","sequence":"additional","affiliation":[{"name":"Photoactivated Processes Unit IMDEA Energy  M\u00f3stoles Madrid Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mariam","family":"Barawi","sequence":"additional","affiliation":[{"name":"Photoactivated Processes Unit IMDEA Energy  M\u00f3stoles Madrid Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marta","family":"Liras","sequence":"additional","affiliation":[{"name":"Photoactivated Processes Unit IMDEA Energy  M\u00f3stoles Madrid Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"V\u00edctor A.","family":"de la Pe\u00f1a O'Shea","sequence":"additional","affiliation":[{"name":"Photoactivated Processes Unit IMDEA Energy  M\u00f3stoles Madrid 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